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My dakota is the quad cab. 3.7 v6. has 46,000 miles. Has k&n filter all terrain tires. Just installed new ngk yrridium plugs. I use mobil 1 clean 5000 conventional oil. No other mods. I get an average of highway and city of about 16.5mpg. on Shell gas 89 octane. i got 17.5 with premium shell gas. I mostly travel highway and i never get close to 20mpg. if i do just city i get 13-14.5 mpg.